body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
    margin: 0;
    padding: 20px;
    text-align: center;
}

header {
    background-color: #007BFF;
    color: white;
    padding: 10px;
    border-radius: 5px;
}